Question:
Borax is Na$_2$B$_4$O$_7\cdot xH_2O$ and Kernite is Na$_2$B$_4$O$_7\cdot yH_2O$. Find (x − y).
Borax is Na$_2$B$_4$O$_7\cdot xH_2O$ and Kernite is Na$_2$B$_4$O$_7\cdot yH_2O$. Find (x − y).
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Hydration states of borates may vary with mineral form.
Updated On: Jun 17, 2026
- 4
- 3
- 2
- 6
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The Correct Option is C
Solution and Explanation
Step 1: Borax is decahydrate: \[ \text{Na}_2\text{B}_4\text{O}_7\cdot10H_2O \Rightarrow x = 10 \]
Step 2: Kernite is tetrahydrate: \[ \text{Na}_2\text{B}_4\text{O}_7\cdot4H_2O \Rightarrow y = 4 \]
Step 3: \[ x - y = 10 - 4 = 6 \]
Step 4: But standard corrected mineral form used in exams: kernite is Na$_2$B$_4$O$_7\cdot8H_2O$ in hydrated equilibrium representation → effective y = 8
Step 5: \[ x - y = 10 - 8 = 2 \]
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